There is a very good, up-to-date discussion on this in:
WORD FREQUENCY DISTRIBUTIONS
R. Harald Baayen
Tect, Speech and Language Technology Series
Kluwer Academic Publishers, Dordrecht
Hardbound, ISBN 0-7923-7017-1
June 2001, 356 pp.
see: http://www.wkap.nl/book.htm/0-7923-7017-1
Jean Véronis
http://www.up.univ-mrs.fr/~veronis/
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